> +COMPAT_SYSCALL_DEFINE3(aarch32_statfs64, const char __user *, pathname,
> +		       compat_size_t, sz, struct compat_statfs64 __user *, buf)
> +{
> +	if (sz == 88)
> +		sz = 84;
> +
> +	return kcompat_sys_statfs64(pathname, sz, buf);

This really needs a comment, and it looks very obviously bogus.
In case it isn't it needs a very good explanation.